ONE-DECIBEL INSERTION LOSS 1-14.3 GHz ULTRAWIDEBAND BANDPASS FILTER USING STANDARD 0.18μm CMOS TECHNOLOGY

摘要

A low insertion loss ultrawideband (UWB) bandpass filter (BP filter) with two finite transmission zeros (f_(z1) and f_(z2)) at high-frequency stopband by 0.18μm CMOS technology was demonstrated. fz1 (the lower frequency one) and f_(z2) can be tuned individually by the shunt branch (L_2, R_(s2), C_3, and C_4 + C_(p2)) and the series inductor (L_1, R_(s1), and C_(p1)), respectively. The microstrip line interconnection lines as well as the spiral inductors were implemented by the 2.34-μm-thick topmost metal (M_6) to minimize the resistive loss. This filter achieved insertion loss (1/S_(21)) lower than 3 dB for frequencies 1-14.3 GHz, stopband rejection better than 20 dB for frequencies higher than 20.4 GHz, and input return loss (S_(11)) better than -10 dB for frequencies 2.4-16.4 GHz. The minimum insertion loss was 1 dB at 4.2 GHz. To our knowledge, this is one of the best results ever reported for a CMOS UWB BP filter in the literature.